Device adapted to maintain for a predetermined period of time a continuously-moving band, film, or the like opposite a stationary body



Dec. 29,1925 1,567,746

' A. MICHETTI DEVICE ADAPTED TO MAINTAIN FOR A PREDETERMINED PERIOD OF TIME A CONTINUOUSLY MOVING BAND, FILM,'0R THE LIKE OPPOSITE A STATIONARY BODY Filed-March l, 1924 17 9 g y r g i 5 6 1.9 M55" g 14 {2' l g 15 3? i if 1/ 1' A 10 i 5 00a I J4/L "I5 Patented Dec. 29, 1925. i UNITED STATES 1,567,746 PATENT OFFICE- A'Lnss mnno mronn'r'rr, or 1mm, ITALY.

DEVICE nnnr'rnn To uimr'mm ron arnnnn'rnnumnnrnmonor run: A- con- TINUOUSLY-MOVING BAND, FILM, on THE LIKE orrosrrn A s'rnmro mmx BODY.

Application filed March 1,1924. Serial in; 696,371.

To all whom it may concern:

Be it known that I, ALESSANDRO MICIIET- TI, a subject of the King of Italy, and residing at 3 Lungotevere Castello, Rome, Italy, have invented certain new and useful improvements in devices adapted to maintain for ap'redetermined period of time a length of film. '50

continuously-moving band, film, or the like opposite a stationary body, of which the following is a specification.

The object of he invention is to provide a device adapted to maintain for a required period of time a length of a continuously moving band, film or the like stationary opposite a stationary body. This device is intended more particularly foruse in cinematographic apparatus, but it may of course be applied to any other use where the same purpose is to be obtained. Supposing the invention be applied to a cinematographic apparatus where a length of film must be held stationary -opposite the lens for a suitable period of timeto produce its impression and after the impression be rapidly removed and replaced by a fresh length of film.

According' to the invention this is not obtained by imparting an intermittent motion to. the film as usual, but the film is made to travel with a continuous forward motion and the length of the film to; be impressed is held opposite the lens for the period of time required for its impression by the said length of film being displaced in an opposite direction to the travel-ofthe film and with a 'speed'equal to the speed of travel s'o'that the filmis held as it were stationary before the lens. After theimpression the auxiliary motion is inverted and the speed of this motion almost instantaneously increased so that the length of film that has been impressed is rapidly carried out of the reach of the lens not only through the reversed auxiliarymotion butalso through the forward travel of the film.

These two' notions' will be adjusted so that I their combined effect will be to displace the film exactly to the extent of the impressed The auxiliary motion of the film first in an opposite direction to its travel and thereafter in the direction of travel may be -obtained in many ways, for example by mounting the sprocket wheel that feeds the film on a slidable support adapted to have 1 apparatus.

' The drawing shows schematically by way of example a constructional form of a device a vertical to and fro motion imparted to it by a cam acting on the support and controlled by -the driving mechanism of the according to the invention, Figure 1 being a side view and Figure 2 a front view thereof. a

The film travels with a continuous motion in the direction indicated by the arrows from stationary rollers 2, 2 to statlonary rollers 3, 3 by way of rollers 4, 5, 6 mounted on a slidable support 7. The rollers 4 and 6 are loosely mounted on their axles, while the roller 5 which is provided 'with teeth to engage the usual perforations in the film, has acontinuous and uniform rotary motion impartedto it to produce the advance of the film.

The toothed roller or sprocket wheel 5 receives its rotary motion through a pivotally mounted lever B from a gear wheel 9 which meshes with a gear wheelv 10 on a driving shaft 11.

v The slidable support 7 has mountedon its lower end a note ed member 12 adapted to receive between its jaws the circumferential flange of a cam 13 so as to have to 'follow the contour of the cam during its rotation. The cam is secured to a flywheel 14 whlch is rigidly eonnected with the gear wheel 10 and with the shaft 11 which by means of a motor or a crank handlev and a sultable gearing has a rotary motion imparted to it to drive the mechanism.

Inthe example illustrated the gear wheel 9, is supposed to make one revolution for each three revolutions of the gear wheel 10 and the sprocket wheel 5 will thus have completed one third of its revolution when. J

the gear wheel 10 has completed one revolution and this allows the circumference of during five sixths of its revolution, viz,

between the. points 16 and 15, a-uniform upward movement of the slidable support with a speed equal to that imparted to the film in the opposite direction by the sprocket -wheel 5. In this 'way, a point, for example the. wheel 5 being equal to theJength of 'thre'e photograms. V

The cam 13 is shaped so as to producerevolution, between the points 15 and 16, the cam will produce a rapid backward movement of the slidable support 7, which assists the continuous forward travel of the film, so that the impressed length of. film will be rapidly removed and replaced by a new length of film, The support is then again caused to rise by the cam so as to allow this new length of film being impressed.

The film 1'is guided between the rollers 2, 2 and the roller t by a guidelS and between the sprocket wheel 5 and the rollers 3, 3 by a guide 19, these guides being suitably hinged so as not to interfere with the to and fro motion of the support 7, the latter being guided in any convenient way to secure a perfect vertical sliding motion. The film is introduced between thefrollers 2, 2' and will be engaged by the sprocket wheel 5 so that on the mechanism being turned the film is caused totrayel alongthe guide 19 and through the rollers 3, 3 out of the apparatus.

What I claim is:

1. A cinematographic film feed .device, comprising, oscillable parallel film guide arms, a reciprocable frame pivotally mounted on the guide arms, means for reciprocattatable disk, a cam on the disk and projecting atsubstantially right angles to the face of the disk, and a forked shape' arm connected to the frame, the forked shape arm engaging the'cam on either side thereof.

- 2. A cinematographic film feed device, comprising, oscillable parallel filmguide arms, a reciprocable frame pivotally mounted on the guide arm's, means for reciprocating the frame, and a sprocket film drive roller carried by the said frame, said means for reciprocating the frame including, a rotatable disk, a cam on the disk and projecting at substantially right angles to the face of the disk, and a forked shape arm connected to the frame, the forked shape arm engaging the cam on either side thereof, the forked shape arm and the frame being rigidly interconnected, all the parts of the fork being stationary, whereby to avoid lost motion.

In testimony whereof I have si ed my name at Rome this 12th day of g nuary,

ALESSANDRO MICHETTI. 

